Coercive force and 90° domain wall motion in ferroelectric PLZT ceramics with square hysteresis loops

The polarization reversal of some tetragonal-phase PLZT ceramics is studied. The results are explained in terms of 90° domain wall motions. A reported theory originally derived for rhombohedral-phase PLZT 6/65/35 ceramics is shown to be applicable to tetragonal-phase PLZT ceramics also by introducing the remanent degree of 90° domain alignment γ90. As a result, the calculation of coercive force is possible for various PLZT compositions considering the interaction of 90° domain wall motions and reacting forces established by the internal stress state of ferroelectric ceramics. The frequency dependence of coercive force and measurements of switching strain, including depolarization data obtained from either mechanically or electrically produced external forces, confirm the interpretation of predominantly occuring 90° reorientations and are consistent with the extended theory.

[1]  Naoya Uchida,et al.  Temperature and Bias Characteristics of Pb(Zr-Ti)O3 Families Ceramics , 1965 .

[2]  A. F. Devonshire.  XCVI. Theory of barium titanate , 1949 .

[3]  W. J. Merz,et al.  Double Hysteresis Loop of BaTiO 3 at the Curie Point , 1953 .

[4]  Rolf Landauer,et al.  Polarization Reversal in the Barium Titanate Hysteresis Loop , 1956 .

[5]  K. H. Hardtl.  Physics of ferroelectric ceramics used in electronic devices , 1976 .

[6]  K. Carl.  Ferroelectric properties and fatiguing effects of modified PbTiO3 ceramics , 1975 .

[7]  B. Jaffe.  CHAPTER 7 – SOLID SOLUTIONS OF Pb(Ti, Zr, Sn, Hf)O3 , 1971 .

[8]  Charles F. Pulvari,et al.  Phenomenological Theory of Polarization Reversal in BaTiO3 Single Crystals , 1958 .

[9]  T. Ikeda,et al.  Electrostriction in Perovskite-Type Ferroelectric Ceramics , 1967 .

[10]  A. Meitzler,et al.  Polymorphism and penferroelectricity in PLZT ceramics , 1973 .

[11]  D. Berlincourt,et al.  Domain Processes in Lead Titanate Zirconate and Barium Titanate Ceramics , 1959 .

[12]  M. Lines.  Statistical Theory for Displacement Ferroelectrics , 1969 .

[13]  R. Landauer,et al.  Dielectric Behavior of Barium Titanate in the Paraelectric State , 1955 .

[14]  C. E. Land,et al.  Hot‐Pressed (Pb,La)(Zr,Ti)O3 Ferroelectric Ceramics for Electrooptic Applications , 1971 .

[15]  S. K. Kurtz,et al.  Atomic Displacement Relationship to Curie Temperature and Spontaneous Polarization in Displacive Ferroelectrics , 1968 .

[16]  G. Kruger,et al.  Domain wall motion concept to describe ferroelectric rhombohedral PLZT ceramics , 1976 .

[17]  G. Kruger,et al.  Coercive field in fine-grained plzt ceramics , 1976 .